<!DOCTYPE html>          
<html>          
<head>          
    <meta charset="UTF-8">      
    <meta name="viewport" content="width=device-width, initial-scale=1.0, minimum-scale=1.0, maximum-scale=1.0, user-scalable=no">    
    <title>有一个高度自适应的div,里面有两个div,一个高度100px,希望另一个填满剩下的高度(三种方案)</title>        
    <style type="text/css">  
        html,
        body { height: 100%; padding: 0; margin: 0; }
 
        /*方案一*/
        /*.outer { height: 100%; padding: 100px 0 0; box-sizing: border-box ; }
        .A { height: 100px; margin: -100px 0 0; background: #BBE8F2; }
        .B { height: 100%; background: #D9C666; }*/
 
        /*方案二*/
        /*.outer { height: 100%; padding: 100px 0 0; box-sizing: border-box ; position: relative; }
        .A { height: 100px; background: #BBE8F2; position: absolute; top: 0 ; left: 0 ; width: 100%; }
        .B { height: 100%; background: #D9C666; }*/
 
        /*方案三*/
        .outer { height: 100%; position: relative; }
        .A { height: 100px; background: #BBE8F2; }
        .B { background: #D9C666; width: 100%; position: absolute; top: 100px ; left: 0 ; bottom: 0; }
    </style>        
</head>          
<body>  
    <div class="outer">
        <div class="A"></div>
        <div class="B"></div>
    </div>
</body>          
</html>